LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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3. AV 1/2/3 doesn’t display
Check J6 00,J600,JK 607,JK618
Can you see t he normal wavefo rm?
Check th e in pu t o f Vid eo switch (IC700).
Can you see t he normal wavefo rm?
YES
NO
J600,J 601 or SIDE AV may have problem.
Replace th is Jack o r SIDE AV.
NO
After ch eckin g th e Power of AV switch you
should decide to replace AV switch or not.
Check th e output of Main IC(IC100).
Esp ecially you sh ould ch eck
The H,V sync and c loc k.
Can you see t he normal wavefo rm?
YES
NO
After ch eckin g th e Power of Main IC(IC100) you
should decide to replace Main IC or not .
This bo ard has b ig problem becau se Main
IC(IC100) have some troubles.
Afte r c hecking thoro ugh ly all pa th onc e again,
You sh ou ld decid e to rep lace Main Bo ard or no t.
YES
4. Component doesn’t display
Check J7 01.
Can you see t he normal wavefo rm?
Check th e in pu t o f Compo nent Audio
switch (IC1001) ,
Can you see t he normal wavefo rm?
Check th e output of Comp on ent Audio
switch (IC1001) ,
Can you see t he normal wavefo rm?
YES
YES
YES
NO
J701
may have problem. Rep lace th is Jack.
NO
Afte r c hecking the Power of compone nt Audio
switch, y ou should decide to replace component
Audio s witch or not.
NO
Afte r c hecking the Power of compone nt Audio
switch y ou should decide to replace component
Audio s witch or not.
Check th e output of Main IC(IC100).
Esp ecially you sh ould ch eck
The H,V sync and c loc k.
Can you see t he normal wavefo rm?
YES
NO
After ch eckin g th e Power of Main IC(IC100) you
should decide to replace Main IC or not .
This bo ard has b ig problem becau se Main
IC(IC100) have some troubles.
Afte r c hecking thoro ugh ly all pa th onc e again,
You sh ou ld decid e to rep lace Main Bo ard or no t.
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